Backlight module and display device

Abstract

A backlight module and a display device are provided. A back plate of the backlight module has a first surface and a second surface. The back plate comprises a metal portion and an insulating portion, and electrical connection pads are disposed in the insulating portion. The first and second electrical connection pads are disposed on the first surface and electrically coupled to each other. The third and fourth electrical connection pads are disposed on the second surface. The first electrical connection pad is correspondingly coupled to the third electrical connection pad, and the second electrical connection pad is correspondingly coupled to the fourth electrical connection pad. A driving circuit board comprises a fifth electrical connection pad. The fifth electrical connection pad is correspondingly coupled to the first electrical connection pad. A light emitting unit comprises a sixth electrical connection pad correspondingly coupled to the fourth electrical connection pad.

What is claimed is: 
     
       1. A backlight module, comprising:
 a back plate having a first surface and a second surface opposite to the first surface, and the back plate comprises a metal portion and an insulating portion, wherein the insulating portion surrounds the periphery of the metal portion; 
 a first electrical connection pad, a second electrical connection pad, a third electrical connection pad and a fourth electrical connection pad disposed in the insulating portion, wherein, the first electrical connection pad and the second electrical connection pad are disposed on the first surface of the back plate and are electrically coupled to each other through the metal portion, the third electrical connection pad and the fourth electrical connection pad are disposed on the second surface of the back plate, the first electrical connection pad is correspondingly coupled to the third electrical connection pad, and the second electrical connection pad is correspondingly coupled to the fourth electrical connection pad; 
 a driving circuit board disposed on the first surface of the back plate and comprises a fifth electrical connection pad, wherein the fifth electrical connection pad is correspondingly coupled to the first electrical connection pad; and 
 a light emitting unit disposed on the second surface of the back plate and comprises a sixth electrical connection pad, wherein the sixth electrical connection pad is correspondingly coupled to the fourth electrical connection pad. 
 
     
     
       2. The backlight module according to  claim 1 , further comprising:
 a seventh electrical connection pad disposed on the first surface of the back plate, wherein the back plate further comprises a grounding portion, the seventh electrical connection pad is disposed in the grounding portion, and the driving circuit board further comprises an eighth electrical connection pad which is correspondingly coupled to the seventh electrical connection pad and coupled to a ground terminal of the driving circuit board. 
 
     
     
       3. The backlight module according to  claim 1 , further comprising:
 a ninth electrical connection pad disposed on the second surface of the back plate, wherein the back plate further comprises a grounding portion, the ninth electrical connection pad is disposed in the grounding portion, and the light emitting unit further comprises a tenth electrical connection pad which is correspondingly coupled to the ninth electrical connection pad and coupled to a ground terminal of a circuit board of the light emitting unit. 
 
     
     
       4. The backlight module according to  claim 1 , wherein the insulating portion surrounds the first electrical connection pad, the second electrical connection pad, the third electrical connection pad and the fourth electrical connection pad. 
     
     
       5. The backlight module according to  claim 1 , wherein the third electrical connection pad and the fourth electrical connection pad are electrically coupled to each other through the metal portion. 
     
     
       6. The backlight module according to  claim 1 , wherein the back plate further comprises a grounding portion, and the grounding portion and the metal portion are electrically insulated from each other through the insulating portion. 
     
     
       7. The backlight module according to  claim 1 , further comprising:
 an insulating member disposed on the first surface or the second surface of the back plate, wherein the insulating member covers the metal portion. 
 
     
     
       8. The backlight module according to  claim 7 , wherein the insulating member further covers the second electrical connection pad. 
     
     
       9. The backlight module according to  claim 1 , wherein the driving circuit board further comprises an eighth electrical connection pad, a driving circuit and a circuit board, the driving circuit, the fifth electrical connection pad and the eighth electrical connection pad are disposed on the circuit board, and the eighth electrical connection pad is coupled to a ground terminal of the driving circuit. 
     
     
       10. The backlight module according to  claim 1 , wherein the light emitting unit further comprises a tenth electrical connection pad, a circuit board and at least one light emitting element, the light emitting element, the sixth electrical connection pad and the tenth electrical connection pad are disposed on the circuit board, and the tenth electrical connection pad is coupled to a ground terminal of the circuit board. 
     
     
       11. A display device, comprising:
 a display panel; and 
 a backlight module disposed opposite to the display panel and comprises a back plate, a first electrical connection pad, a second electrical connection pad, a third electrical connection pad, a fourth electrical connection pad, a driving circuit board and a light emitting unit, wherein the back plate comprises a first surface and a second surface opposite to the first surface, the back plate comprises a metal portion and an insulating portion, and the insulating portion surrounds the metal portion, the first electrical connection pad, the second electrical connection pad, the third electrical connection pad and the fourth electrical connection pad are disposed in the insulating portion, the first electrical connection pad and the second electrical connection pad are disposed on the first surface of the back plate and are electrically coupled to each other through the metal portion, the third electrical connection pad and the fourth electrical connection pad are disposed on the second surface of the back plate, the first electrical connection pad is correspondingly coupled to the third electrical connection pad, the second electrical connection pad is correspondingly coupled to the fourth electrical connection pad, the driving circuit board is disposed on the first surface of the back plate and comprises a fifth electrical connection pad, the fifth electrical connection pad is correspondingly coupled to the first electrical connection pad, the light emitting unit is disposed on the second surface of the back plate and comprises a sixth electrical connection pad, wherein the sixth electrical connection pad is correspondingly coupled to the fourth electrical connection pad. 
 
     
     
       12. The display device according to  claim 11 , wherein the backlight module further comprises a seventh electrical connection pad disposed on the first surface of the back plate, wherein the back plate further comprises a grounding portion, the seventh electrical connection pad is disposed in the grounding portion, and the driving circuit board further comprises an eighth electrical connection pad which is correspondingly coupled to the seventh electrical connection pad and coupled to a ground terminal of the driving circuit board. 
     
     
       13. The display device according to  claim 11 , wherein the backlight module further comprises a ninth electrical connection pad disposed on the second surface of the back plate, wherein the back plate further comprises a grounding portion, the ninth electrical connection pad is disposed in the grounding portion, and the light emitting unit further comprises a tenth electrical connection pad which is correspondingly coupled to the ninth electrical connection pad and coupled to a ground terminal of a circuit board of the light emitting unit. 
     
     
       14. The display device according to  claim 11 , wherein the insulating portion surrounds the first electrical connection pad, the second electrical connection pad, the third electrical connection pad and the fourth electrical connection pad. 
     
     
       15. The display device according to  claim 11 , wherein the third electrical connection pad and the fourth electrical connection pad are electrically coupled to each other through the metal portion. 
     
     
       16. The display device according to  claim 11 , wherein the back plate further comprises a grounding portion, and the grounding portion and the metal portion are electrically insulated from each other through the insulating portion. 
     
     
       17. The display device according to  claim 11 , wherein the backlight module further comprises an insulating member, the insulating member is disposed on the first surface or the second surface of the back plate, and the insulating member covers the metal portion. 
     
     
       18. The display device according to  claim 17 , wherein the insulating member further covers the second electrical connection pad. 
     
     
       19. The display device according to  claim 11 , wherein the driving circuit board further comprises an eighth electrical connection pad, a driving circuit and a circuit board, the driving circuit, the fifth electrical connection pad and the eighth electrical connection pad are disposed on the circuit board, and the eighth electrical connection pad is coupled to a ground terminal of the driving circuit. 
     
     
       20. The display device according to  claim 11 , wherein the light emitting unit further comprises a tenth electrical connection pad, a circuit board and at least one light emitting element, the light emitting element, the sixth electrical connection pad and the tenth electrical connection pad are disposed on the circuit board, and the tenth electrical connection pad is coupled to a ground terminal of the circuit board.